Sewing-machine



G. A. SCHICK.

SEWING MACHINE.

APPLICATION FILED OCT. 13. 1917.

Patented July 8, 1919.

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G. A. SCHICK.

SEWING MACHINE} APPLICATION FILED 0CT.13, 1911.

Patented July 8, 1919.

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SEWINGMACHINE.

APPLICATION FILED 00113, x911.

Patented July 8, 1919.

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UNITED STATES PATENT OFFICE.

GEORGE A. SGHICK, OF PHILADELPHIA, PENNSYLVANIA.

SEWING-MACHINE.

Application filed October 13, 1917.

To all whom it may concern Be it known that I, Gnonen A. ScHIoK, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented a Sewing-Machine, of which the following is a specification.

One object of this invention is to provide a machine of the general type described and claimed in the patent to B. F. Rhodes, #1,191,094-, dated July 11, 1916, with novel means for adjustably and removably supporting the hook ;the arrangement of parts being such as to permit of the quick and convenient removal and replacement of this member and at the same time allow of its accurate setting.

Another obj eot of the invention is to pro vide a novel mounting for the hook of a machine of the type noted, whereby the part thereof subject to breakage or injury under operating conditions, may be con veniently removed and replaced without affecting the main supporting body thereof ;the invention also contemplating a novel hook mounting which permits of the convenient alteration of the relative posi tion of said hook with regard to the needle.

A further object of the invention is to provide novel means for insuring proper positioning of the lower thread with regard to the hook, for which purpose the thread carrying finger is provided with a thread guide movable with it ;it being also desired to provide means whereby the position of said finger may be accurately and' conveniently altered with regard to the needle and its associated parts.

These objects and other advantageous ends I secure as hereinafter set forth, reference being had to the accompanying drawings, in which, I

Figure l is an elevation, partly in section, illustrating my invention as applied to a sewing machine of the type above referred to;

Fig. 2 is a side elevation of the hook with certain of its associated parts;

Fig. 3 is an end elevation of the threadcarrying finger;

Figs. 4 to 7 inclusive are plan views, to some extent diagrammatic, illustrating certain steps in the operation of the machine;

Figs. 8 to 12 inclusive are plans also partly diagrammatic, further illustrating the operation of the machine;

Figs. 13 to 15 inclusive are perspective Specification of Letters Patent.

Patented July 8, 1919.

Serial No. 196,425.

views showing certain steps in the formation of the stitches;

Fig. 16 is a plan similar to Figs. -1 to 7 showing the operation of the apparatus when the object being stitched is abruptly turned; and

Fig. 17 is a plate.

In the above drawings I have illustrated merely sufiicient of the sewing machine, of which my invention forms a part, to permit of a full understanding of the construction and operation of those members constituting said invention. In said drawings, 1 represents the throat plate which forms part of or is mounted on the work-support of the machine. Above this plate there is provided a vertically movable presscr foot 2 and a thread guide 3 in the shape of a vertically extending rod havinga right angle projecting arm 41 at its lower end, whose extremity is curved on the arc of a circle approximately concentric with the rod 3 and has a vertical perforation for the thread in its outer end. A vertically re ciprocable awl 6 is provided in front of the supporting stem 7 of the presser foot 2, and on that side of the latter opposite the thread guide 3 is mounted an upper thread-carrying finger 8 projecting in a horizontal plane at the lower end of an oscillatory rod 9. The above noted elements are supported and actuated in proper timed relation by mechanism clearly described and illustrated in the patent above referred to, but as they form no part of the present invention they have not been illustrated.

That portion of the throat plate 1 immediately under the awl 6, the thread guide plan of part of the throat '8 and the upper finger 8, is preferably of an upwardly convex form and has formed in it, vertically in line with said awl, a keyhole slot 10, 'Fig. 16, having at one side a narrow extension 11 for a purpose hereafter referred to ;the work operated on being indicated at 00 and in the case shown consisting of a leather strip which it is desired to reinforce by the provision therein of lines of relatively heavy stitches. One side of said slot is formed to provide'a shoulder 50.

Below the throat plate is mounted the hook 12 which includes a suitably split block 18 clamped by a screw 14 to a spindle 15, designed to be periodically oscillated on its vertical axis. Said block at one side is horizontally slotted to provide a guideway for a shank 16, which is threaded at one end for the reception of an adjusting nut 17 and is designed to be clamped in any adjusted position by a screw 18 passing through a slot 19 in the side of said block. The end of the shank 16 opposite its threaded portion is extended up and outwardly and has a slot or passage of substantially right angular form for the reception of the supporting end of the hook proper 20 which is rigidly held to it by a clamping screw 21.

The hook, after projecting outwardly from its recess in the shank 16, bends sharply at right angles and is also curved upwardly at an angle of approximately 15 degrees to the horizontal, while its extremity is bent back in a substantially vertical plane to constitute its thread engaging portion. By means of the knurled nut 17, the shank with said needle may be moved toward or from the supporting spindle 15 and thereafter the setting up of the screw 18 permanently retains these parts in their given positions.

It is noted that this adjustment is provided to vary the position of the hook 20 with reference to the line of operation of the needle 22, which is reciprocable vertically in the line of the awl 6, and is formed with its upper end hooked so as to be capable of drawing the thread downwardly after this has been engaged. Said needle likewise has a bodily movement in a vertical plane, so that after having engaged the article to be sewed, it carries the same rearwardlv and thereafter disengages it, as is clearly described in the Rhodes patent above noted.

Also operative under the throat plate 1 is the lower thread engaging finger 23, whose shank or base 24 extends below and approximate ly at right angles to its body, being slidable in a guideway formed in an arm 25 projecting from an oscillatory rod 26, whereby the free end of said finger may be moved toward and from the line of operation of the awl and needle. Said shank 24 is providedwith one or more slotted openings for the reception of screws 27 whereby it may be clamped in any adjusted position within the guideway This finger 23 is characterized by being provided with and supporting a thread guide preferably formed by a wire coil 28, supported at one side of and slightly below the plane of the generally fiatbody of said finger.

The end of the finger has a pointed outline and at the base of one side has a projection 29 forming a thread receiving throat or fork. The same side of said point is extended downwardly at right angles to the plane of the body of the finger as indicated at 30, sloping downwardly from its forward extremity and having its rear edge notched as indicated at 31. Also in front of the line of operation of the needle and awl is a third vertical spindle 32 to which is clamped a split sleeve 33, having a. horizontal passage for the reception of a loop disengaging member 34 which may be clamped in any desired position in said sleeve by a screw 35.

lVith the above described arrangement of parts, it is to be understood that the hook, the lower thread finger, the needle and the loop-disengaging member temporarily remain inactive, while those elements above the throat plate 1 pass through. the cycle of operations illustrated in Figs. at to 7 inclusive. At the beginning of said cycle, the needle is in its fully lowered position in engagement with a thread loop which it holds in a vertical position. This loop consists of the upper thread 3 which passes through the eye or perforation of the thread guide 5, thence through the object 00 to be sewed, down through the opening 10 of the throat plate, around the needle 22, and thence to the last stitch formed in said obj eet w.

The lower thread .2 at this time extends through the coil 28 constituting the lower thread guide, thence through the notch 31 of the finger 23, through the throat plate and to the last stitch formed in the body 90. In order to form another stitch, a hole is first made in the strip or body 00 by the awl, which for this purpose is forced down through it and through the opening in the throat plate, after which, as said awl is raised, the needle 22 is moved vertically upward into the hole so formed. The rod or spindle 3 of the upper thread guide is then rotated through a small angle so that its thread carrying end 5 moves in the direction of the arrow, Fig. 4, to draw the thread between it and the body a, and occupies a position in front of the upper thread finger 8, as shown in Fig. 5.

The rod 9 with said finger is then swung bodily toward the right and to the rear of the needle, carrying the thread into an inclined position across the vertical plane in which said needle thereafter moves from the front toward the rear of the machine. In so moving the needle bodily carries the strip 60 rearwardly, and as it is at the same time drawn downwardly, its hook engages the upper thread 3 which is thereafter drawn down through the strip to form the loop illustrated in Fig. 1. The upper thread guide then returns to its original position (Fig. 7), as does also the upper thread finger S.

Thereafter the various elements above the throat plate 1 remain in the positions shown in Fig. 1, while those elements of the machine below said plate pass through the cycle of operations illustrated in Figs. 8 to 15 inclusive.

At the beginning of this cycle, the hook 2O lies to one side and in front of the loop held by the needle and from this position it moves toward the latter so that its relatively sharp advancing end passes between the sides of the loop (Fig. 9). The lower thread finger 23 is then swung toward the line of action of the needle, carrying with it the lower thread 2 so that the latter is taken around the hook 20 which continues its movement into the position shown in Fig. 10. By a reverse movement of the-spindle 15, the hook 20 is then withdrawn through the loop held by the needle 22 and in so moving engages the lower thread which it forms into a second loop and draws through said first loop. The thread disengaging member 34 now swings from the position indicated in Fig. 10 to that indicated in Fig. 11, so that its laterally projecting end portion lies in front of the loop held by the needle 22, which then moves bodily for ward in a vertical plane extending fromv front to rear of the machine, with the result that said end of the thread disengaging member forces the loop of the thread 1 out of the hook of said needle and thereafter returns to its normal position shown in Fig. 12.

Suitable means (not shown) now acts on the thread z to draw its downwardly hanging loop 1/ up into the strip a) so that it finally assumes the form shown in Fig. 13, with the loop 2 of the lower thread 2 still held by the hook 20. This latter is then given a slight rearward and then upward movement as indicated by the arrow, Fig. 13, whereby it is caused to disengage its loop, which is then drawn up by the continued tension on the upper thread 1 until its lower end is substantially flush with the under surface of the strip or body 00, thus forming the desired reinforcing plug therein. The hook 20 is then moved to its original position and the various parts are ready to begin another complete cycle of'operations.

In order to permit of the article a" in which the stitches are being formed to be abruptly turned to change the direction or form of the line of stitches indicated diagrammatically in Fig. 16, said article is swung about the line of action of the needle just after the presser foot 2 is raised to permit of the rearward movement of the article by the needle. Hitherto it has been found that at such time the shifting of the position of the article as frequently caused the lower thread 2 to lead therefrom in such a direction that it was not always engaged and carried rearwardly by the finger 23. In order to prevent this failure of action, the keyhole slot 10 in the throat plate is provided with a shoulder 50 over which said thread is naturally drawn by the movement of the article in turning it so that it leads from the rear main portion of the slot 10 to the throat formed by the projection 29 on the point of the finger 23. As a result said tion by turning the nut 17.

lower thread extends to the guide 28 in aline which is unaltered by the swinging or other movement given to the article being sewed, so that the above noted tendency to miss a stitch has been found to be com pletely avoided.

In case the hook 20 should become bent or broken, as occasionally occurs under opcrating conditions, it may be quickly removed by slacking off the screw 21 and thereafter lifting it out of the shank 16 by suitable means, it being noted that all of the above noted parts are customarily operated at a high temperature. Thereafter when a new hook has been inserted and clamped in position, the screw 18 may be slacked off and the position of its thread engaging end may be adjusted to precisely the proper posi- Said screw 18 is then set up so as to clamp the shank with the hook in the desired position.

In adjusting the lower thread finger 23, it is given such position that its projecting portion 29 passes immediately to the rear of the loop of the upper thread, after which the holding screws 27 are set up to hold it rigidly in position.

I claim l. The combination in a sewing machine of a throat plate; a thread finger operative below said plate; and a wire having one end fixed to the finger and its opposite end formed to provide a thread guide carried by and movable with said finger.

2. The combination in a sewing machine of a throat plate; a finger movable adjacent said plate and having a thread receiving fork; with a member including a tubular coil constituting a thread guide having one end fixed to and movable with said finger.

3. The combination in a sewing machine of a vertically'movable hooked needle; a hook movable toward and from the line of action of said needle; a movable forked finger for carrying a thread toward the line of action of the hook; and a thread guide spaced away from but carried by the body of the finger for leading a thread to the fork thereof in a. substantially constant position.

4. The combination in a sewing machine of a finger in the form of a forked plate; and a rearwardly notched extension projecting downwardly from one of the branches of the fork to the finger.

5. The combination in a sewing machine of a hook; a finger for periodically moving a thread into the path of movement of said hook and formed with a fork having a long and a short branch; with a downwardly projecting, rearwardly notched extension for the long side of the fork of said finger.

6. The combination in a sewing machine of a hook; a finger for periodically moving a thread into the path of movement of said hook and formed with a fork having a long and a short branch; a downwardly projecting rearwardly notched extension for the long side of the fork of said finger; with a thread guide attached to the finger and positioned to lead a thread through the notch of said extension into the fork of the finger.

T. The combination in a sewing machine of a loop forming hook; a thread guide having a forked end and movable toward and from the path of movement of said' hook; with a wire connected to the finger and having a coiled portion adjacent thereto in position to form a guide for thread passing to the finger.

8. The combination in a sewing machine of an oscillatory spindle; a member clamped thereto; a needle; with a hook carried by said member and a device on the member for varying the position of the hook relatively to the needle.

9. The combination in a sewing machine of a needle; a block having a guideway; a hook shank longitudinally adjustable in the guideway; and a hook removably mounted on said shank.

10. The combination in a sewing machine of a needle; an oscillatory spindle extending substantially parallel to said needle; a block clamped to said spindle and having a guideway; a shank slidably mounted in said guideway and having a threaded portion; a nut for the threaded portion engaging the block, for adjusting the shank in said guideway; and a hook removably mounted on the shank.

11. The combination in a sewing machine of a needle; an oscillatory spindle; a hook shank mounted on said spindle and having a recess including two parts at an angle to each other; a hook having one end formed to fit said two parts of the recess of said shank; and means for clamping the hook to the shank.

12. The combination in a sewing machine of a needle; an oscillatory spindle; a hook shank mounted on said spindle and having a recess including two parts at an angle to each other; a hook having one end formed to fit said two parts of said recess in the shank; means for clamping the hook to the shank; and a device for adjusting the shank to move the hook relatively to the needle.

13. The combination in a sewing machine of a throat plate having an Opening; a needle movable in a line with said opening; a loopforming hook; a finger for delivering a thread into position to be engaged by said hook; a guide placed to determine the position of part of the thread extending through the opening in the throat plate; and means for insuring the positioning of the thread before its engagement by the finger regardless of the movement imparted to it by movement of the object operated on.

1%. The combination in a sewing machine of a throat plate having an opening; a needle movable in a line with said opening; a loop forming hook; a finger for delivering a thread into position to be engaged by said hook; a guide placed to determine the position of part of the thread extending through the opening in the throat plate; and means for insuring the positioning of the thread before its engagement by the finger regardless of the movement imparted to it by movement of the object operated on, said means consisting of a shoulder projecting into the opening in the throat plate.

15. The combination in a sewing machine of a finger in the form of a pointed plate having a projecting branch at the base end of one side; with a rearwardly notched extension projecting down from said side of the point.

In witness whereof I afiix mysignature.

GEORGE A. SGHICK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

